2WA/2NJ/2RK
7-486
F278: Secondary power source error
The operation became unstable since the primary supply power dropped out temporarily and recovered.
5 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Replacing
the engine
PWB
Step Check description Assumed cause Measures Reference
1 Resetting the main power The power reset was per-
formed immediately.
Remove the original and
check the sensor. Next, turn
off the power switch and main
switch. Then, turn on the
main switch and power
switch when passing 5 sec-
onds.
2 Checking the connection The connector is not prop-
erly connected or the wire
is faulty.
Clean the connectors on the
LVU and reinsert the wire
connectors. If there is no con-
tinuity, replace the wire.
3 Replacing the LVU The LVU is faulty. Replace the LVU. Detaching
and Reat-
taching the
LVU
Step Check description Assumed cause Measures Reference
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